Coherence peak and superconducting energy gap in Rb3C60 observed by muon spin relaxation

R. F. Kiefl, W. A. MacFarlane, K. H. Chow, S. Dunsiger, T. L. Duty, T. M. S. Johnston, J. W. Schneider, J. Sonier, L. Brard, R. M. Strongin, J. E. Fischer, and A. B. Smith, III
Phys. Rev. Lett. 70, 3987 – Published 21 June 1993
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Abstract

Muon spin relaxation resulting from spin exchange scattering of endohedral muonium (μ+e) with thermal electronic excitations has been observed in the fullerene superconductor Rb3C60. The temperature dependence of T11 shows a coherence peak just below Tc and can be fit to the conventional Hebel-Slichter theory for spin relaxation in a superconductor with a broadened BCS density of states. The average energy gap for electronic excitations, Δ/kB=53(4) K or 2Δ/kBTc=3.6(3), is consistent with the BCS weak coupling limit.

  • Received 21 April 1993

DOI:https://doi.org/10.1103/PhysRevLett.70.3987

©1993 American Physical Society

Authors & Affiliations

R. F. Kiefl, W. A. MacFarlane, K. H. Chow, S. Dunsiger, T. L. Duty, T. M. S. Johnston, J. W. Schneider, J. Sonier, L. Brard, R. M. Strongin, J. E. Fischer, and A. B. Smith, III

  • TRIUMF, Department of Physics and Canadian Institute of Advanced Research, University of British Columbia, Vancouver, British Columbia, V6T 2A6
  • Laboratory for Research on the Structure of Matter, University of Pennsylvania, Philadelphia, Pennsylvania 19104-6272
  • Materials Science Department, University of Pennsylvania, Philadelphia, Pennsylvania 19104-6272
  • Department of Chemistry, University of Pennsylvania, Philadelphia, Pennsylvania 19104-6323

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Vol. 70, Iss. 25 — 21 June 1993

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